16561655010 has 64 divisors (see below), whose sum is σ = 44306645760. Its totient is φ = 4402218240.

The previous prime is 16561654999. The next prime is 16561655069. The reversal of 16561655010 is 1055616561.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14647 + ... + 182586.

It is an arithmetic number, because the mean of its divisors is an integer number (692291340).

Almost surely, 2^16561655010 is an apocalyptic number.

16561655010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16561655010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22153322880).

16561655010 is an abundant number, since it is smaller than the sum of its proper divisors (27744990750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16561655010 is a wasteful number, since it uses less digits than its factorization.

16561655010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197560 (or 197554 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 16561655010 in words is "sixteen billion, five hundred sixty-one million, six hundred fifty-five thousand, ten".